CVE-2020-26759
Arbitrary code execution in clickhouse-driver
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
CVE-2020-26759- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE List No score
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
CVE-2020-26759- Updated
- 2026-11-02
EUVDEUVD-2021-0043 No score
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
EUVD-2021-0043- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vgv5-cxvh-vfxh
Arbitrary code execution in clickhouse-driver
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
GHSA-vgv5-cxvh-vfxh- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
OSV
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
CVE-2020-26759- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2020-26759
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
DEBIAN-CVE-2020-26759- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 4 moreShow less
OSVGHSA-vgv5-cxvh-vfxh
Arbitrary code execution in clickhouse-driver
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
GHSA-vgv5-cxvh-vfxh- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-26759
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
UBUNTU-CVE-2020-26759- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVBIT-clickhouse-2020-26759 No score
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
BIT-clickhouse-2020-26759- Updated
- 2026-11-02
OSVPYSEC-2021-61 No score
clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.
- Record
PYSEC-2021-61- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
clickhouse-driverPyPI |
before 0.1.5 | 0.1.5 |
clickhouseBitnami |
before 0.1.5 | 0.1.5 |
python-clickhouse-driverDebian:12 |
before 0.2.0-1 | 0.2.0-1 |
python-clickhouse-driverDebian:13 |
before 0.2.0-1 | 0.2.0-1 |
python-clickhouse-driverDebian:14 |
before 0.2.0-1 | 0.2.0-1 |
clickhouse-driverPyPI |
before 0.1.5, plus listed versions 0.0.100.0.110.0.120.0.130.0.14 Show 19 moreShow less0.0.150.0.160.0.170.0.180.0.190.0.20.0.200.0.30.0.40.0.50.0.60.0.70.0.80.0.90.1.00.1.10.1.20.1.30.1.4 |
0.1.5 |
clickhouse-driverPyPI |
before 0.1.5, plus listed versions 0.0.20.0.30.0.40.0.50.0.6 Show 19 moreShow less0.0.70.0.80.0.90.0.100.0.110.0.120.0.130.0.140.0.150.0.160.0.170.0.180.0.190.0.200.1.00.1.10.1.20.1.30.1.4 |
0.1.5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-26759 is a critical vulnerability (CVSS 9.8) in Clickhouse-driver Project Clickhouse-driver, published January 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.69%, the 85th percentile. Fixed in clickhouse-driver 0.1.5.
References
github.com/mymarilyn/clickhouse-driver/commit/d708ed548e1d6f254ba81a21de8ba543a53b5598
nvd.nist.gov/vuln/detail/CVE-2020-26759
security-tracker.debian.org/tracker/CVE-2020-26759
ubuntu.com/security/CVE-2020-26759
cve.org/CVERecord?id=CVE-2020-26759